(chemistry) Any mixture of compounds whose relative concentrations oscillate, and in which such change is marked by a visible rhythmic change in colour.

(idiomatic) Alternative form of round-the-clock.

(idiomatic) nonstop, 24 hours per day.

A device for measuring time by letting water flow out of a container, usually through a tiny aperture. / A clepsydra.

The surface of a clock that contains the dial and hands.

(sports) A clock, especially in American football, that operates continuously in a one-sided game, so as to hasten the end of the contest.

Any timepiece that makes use of the piezoelectric property of a quartz crystal.

Alternative spelling of clock-watcher

(military) A technique of timing the delivery of fires by placing all units on a common time. The synchronized clock uses a specific hour and minute based on either local or universal time. Local time is established using the local time zone.

A person who is eager for time to pass (e.g., at work or school), especially when faced with an undesirable task.